Which sounds just fine to Charlie. Smart he may be, but even he knows himself well enough to admit he's no bloody mastermind. No ambition, a teacher had told him once in primary. Despite all evidence to the contrary, he can't lie to himself: not much has changed.

"Good at that are you?" It's hypothetical though. Must be - Nikolai's here, after all and Charlie likes to think he doesn't need to be told something twice. So after a beat (there's a glance to the mark left in the concrete wall from the knife, a faint twitch of his fingers), he offers his hand to shake. "Partners then?"